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The Far-infrared Polarization Spectrum of ρ Ophiuchi A from HAWC+/SOFIA Observations
Morris, Mark R.; Staguhn, Johannes; Ward-Thompson, Derek +23 more
We report on polarimetric maps made with HAWC+/SOFIA toward ρ Oph A, the densest portion of the ρ Ophiuchi molecular complex. We employed HAWC+ bands C (89 µm) and D (154 µm). The slope of the polarization spectrum was investigated by defining the quantity {{ \mathcal R }}{DC}={p}D/{p}C, where p C…
LISA Pathfinder platform stability and drag-free performance
Mendes, L.; Russano, G.; Lloro, I. +76 more
The science operations of the LISA Pathfinder mission have demonstrated the feasibility of sub-femto-g free fall of macroscopic test masses necessary to build a gravitational wave observatory in space such as LISA. While the main focus of interest, i.e., the optical axis or the x -axis, has been extensively studied, it is also of great importance …
Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS
Bouchy, F.; Deleuil, M.; Kirk, J. +36 more
The detection of low-mass transiting exoplanets in multiple systems brings new constraints to planetary formation and evolution processes and challenges the current planet formation theories. Nevertheless, only a mere fraction of the small planets detected by Kepler and K2 have precise mass measurements, which are mandatory to constrain their comp…
Feedback from OB stars on their parent cloud: gas exhaustion rather than gas ejection
Peretto, N.; Marsh, K.; Fuller, G. A. +1 more
Context. Stellar feedback from high-mass stars shapes the interstellar medium, and thereby impacts gas that will form future generations of stars. However, due to our inability to track the time evolution of individual molecular clouds, quantifying the exact role of stellar feedback on their star formation history is an observationally challenging…
On the Ubiquity and Stellar Luminosity Dependence of Exocometary CO Gas: Detection around M Dwarf TWA 7
Bayo, A.; Wilner, D. J.; Olofsson, J. +2 more
Millimeter observations of CO gas in planetesimal belts show a high detection rate around A stars, but few detections for later type stars. We present the first CO detection in a planetesimal belt around an M star, TWA 7. The optically thin CO (J = 3-2) emission is colocated with previously identified dust emission from the belt, and the emission …
Signatures of an eccentric disc cavity: Dust and gas in IRS 48
Pinte, Christophe; Christiaens, Valentin; van der Marel, Nienke +5 more
We test the hypothesis that the disc cavity in the `transition disc' Oph IRS 48 is carved by an unseen binary companion. We use 3D dust-gas smoothed-particle hydrodynamics simulations to demonstrate that marginally coupled dust grains concentrate in the gas overdensity that forms in the cavity around a low binary mass ratio binary. This produces h…
Predicting the Extreme Ultraviolet Radiation Environment of Exoplanets around Low-mass Stars: GJ 832, GJ 176, and GJ 436
Peacock, Sarah; Barman, Travis; Baron, E. +3 more
Correct estimates of stellar extreme ultraviolet (EUV; 100-1170 Å) flux are important for studying the photochemistry and stability of exoplanet atmospheres, as EUV radiation ionizes hydrogen and contributes to the heating, expansion, and potential escape of a planet’s upper atmosphere. Contamination from interstellar hydrogen makes observing EUV …
WISDOM project - V. Resolving molecular gas in Keplerian rotation around the supermassive black hole in NGC 0383
Williams, Thomas G.; Sarzi, Marc; Cappellari, Michele +7 more
As part of the mm-Wave Interferometric Survey of Dark Object Masses (WISDOM), we present a measurement of the mass of the supermassive black hole (SMBH) in the nearby early-type galaxy NGC 0383 (radio source 3C 031). This measurement is based on Atacama Large Millimeter/sub-millimeter Array (ALMA) cycle 4 and 5 observations of the 12CO(…
Dayside Aurora
Strangeway, Robert J.; Frey, Harald U.; Nishimura, Yukitoshi +5 more
Dayside aurora is related to processes in the dayside magnetosphere and especially at the dayside magnetopause. A number of dayside aurora phenomena are driven by reconnection between the solar wind interplanetary magnetic field and the Earth's internal magnetic field at the magnetopause. We summarize the properties and origin of aurora at the cus…
A UV and optical study of 18 old novae with Gaia DR2 distances: mass accretion rates, physical parameters, and MMRD
Selvelli, Pierluigi; Gilmozzi, Roberto
We combine the results of our earlier study of the UV characteristics of 18 classical novae (CNe) with data from the literature and with the recent precise distance determinations from the Gaia satellite to investigate the statistical properties of old novae. All final parameters for the sample include a detailed treatment of the errors and their …